Which is not a condition for the previous test? In a survey of 1273 adults, 52% said it is not morally wrong to change the genetic makeup of human cells. What test would be indicated to address the following statement: “The majority of adults do not think it is morally wrong to change the genetic makeup of human cells”

at least 12,730 adults in the population

Which is NOT a condition for the test in the previous question? Your company sells exercise clothing and equipment on the Internet. To design the clothing, you collect data on the physical characteristics of your different types of customers. We take a sample of 24 male runners and find their mean weight to be 61.79 kilograms. Assume that the population standard deviation is σ = 4.5.

Sample size should be greater than or equal to 30, or come from a known normal distribution, or have know outliers or skewness in the data

A teacher is interested in performing a hypothesis test to compare the mean math score of the girls and the mean math score of the boys. She randomly selects 10 girls from the class and then randomly selects 10 boys. She arranges the girls' names alphabetically and uses this list to assign each girl a number between 1 and 10. She does the same thing for the boys.

Two-sample t-test. There is no natural pairing between the two populations.

1-sample t-test. The teacher should compare the sample mean for the girls against the population mean for the boys.

Paired t-test. Since the boys and girls are in the same class, and are hence dependent samples, they can be linked.

Either two-sample or paired t-test will work.

Paired t-test. Since there are 10 boys and 10 girls, we can link the two samples.

A researcher is interested in investigating whether people perform better at dexterity tests while listening to classical music or to no music. He designs a dexterity test, and first gives it to his participants while classical music is playing, and then while no music is playing.

Paired t-test, since there are two sets of measurements on the same subjects, providing a natural linking.

z-test, since the researcher can find the standard deviation of his population.

Not enough information is given to determine the best type of test.

Two-sample t-test, since how a subject performs with music should have no influence on how he performs without music, creating two independent samples.

1-sample t-test, since there is only one sample of subjects taking the dexterity tests.

A high school coach uses a new technique in training middle distance runners. He records the times for 4 different athletes to run 800 meters before and after this training. A 90% confidence interval for the difference of the means before and after the training, μ B - μ A , was determined to be (2.6, 4.8).

Based on this sample, with 90% confidence, the average time for the 800-meter run for middle distance runners at this high school is between 2.6 and 4.8 seconds shorter after the new training.

We know that 90% of all random samples done on runners at this high school will show that the mean time difference before and after the training is between 2.6 and 4.8 seconds.

There is a 90% probability that a randomly selected middle distance runner at this high school will have a time for the 800-meter run that is between 2.6 and 4.8 seconds shorter after the training than before the training.

We know that 90% of the middle distance runners shortened their times between 2.6 and 4.8 seconds after the training.

Based on this sample, with 90% confidence, the average time for the 800-meter run for middle distance runners at this high school is between 2.6 and 4.8 seconds longer after the new training.

Five students took a math test before and after tutoring. Their scores were as follows. Do the data suggest that there is a difference in the math scores? Perform a paired t-test at the 5% significance level.

No, the data do not provide sufficient evidence to conclude that the tutoring has an effect on the math scores.

Yes, the data do provide sufficient evidence to conclude that the tutoring has an effect on the math scores.

Which of the following represents the appropriate null & alternative hypotheses? The mean height of women is greater than 64"

H₀: μ > 64" Hₐ: μ ≠ 64"

In testing hypotheses, which of the following would be strong evidence against the null hypothesis?

obtaining data with a small p-value

using a small level of significance

using a large level of significance

obtaining data with a low test statistic

the probability of obtaining the results (or one more extreme) if the null hypothesis is true

the probability that the null hypothesis is true

the probability that the alternative hypothesis is true

Suppose the P-value for a hypothesis test is 0.0304. Using a = 0.05, what is the appropriate conclusion?

b) Reject the alternative hypothesis

c) Fail to reject the null hypothesis

d) Fail to reject the alternative hypothesis